20210121012111 has 16 divisors (see below), whose sum is σ = 27295744872960. Its totient is φ = 13299053302080.

The previous prime is 20210121012101. The next prime is 20210121012119. The reversal of 20210121012111 is 11121012101202.

It is a happy number.

It is not a de Polignac number, because 20210121012111 - 2²¹ = 20210118914959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210121012119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11386150 + ... + 13040883.

It is an arithmetic number, because the mean of its divisors is an integer number (1705984054560).

Almost surely, 2^{20210121012111} is an apocalyptic number.

20210121012111 is a deficient number, since it is larger than the sum of its proper divisors (7085623860849).

20210121012111 is a wasteful number, since it uses less digits than its factorization.

20210121012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24430606.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20210121012111 its reverse (11121012101202), we get a palindrome (31331133113313).

The spelling of 20210121012111 in words is "twenty trillion, two hundred ten billion, one hundred twenty-one million, twelve thousand, one hundred eleven".